NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.

Most active assignees, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXAssigneeOCNRate centerState
231-346 TELNET WORLDWIDE, INC. 817J TRAVERSECY MI
231-347 MICHIGAN BELL TEL CO 9323 PETOSKEY MI
231-348 MICHIGAN BELL TEL CO 9323 PETOSKEY MI
231-349 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BIG RAPIDS MI
231-351 TELNET WORLDWIDE, INC. 817J SCOTTVILLE MI
231-352 MICHIGAN BELL TEL CO 9323 FRANKFORT MI
231-353 TELNET WORLDWIDE, INC. 817J MCBAIN MI
231-354 MICHIGAN BELL TEL CO 9323 CORAL MI
231-355 TELNET WORLDWIDE, INC. 817J FREMONT MI
231-356 TELNET WORLDWIDE, INC. 817J MANCELONA MI
231-357 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
231-358 TELNET WORLDWIDE, INC. 817J CENTRAL LK MI
231-361 TELNET WORLDWIDE, INC. 817J MORLEY MI
231-362 KALEVA TEL. CO. 0703 KALEVA MI
231-363 TELNET WORLDWIDE, INC. 817J CHEBOYGAN MI
231-365 TELNET WORLDWIDE, INC. 817J WOLVERINE MI
231-368 TELNET WORLDWIDE, INC. 817J BALDWIN MI
231-369 ACE TEL. CO. OF MICHIGAN, INC. 0704 SOBOARDMAN MI
231-372 TELNET WORLDWIDE, INC. 817J EVART MI
231-375 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
231-377 FRONTIER NORTH, INC. - MI 0695 CLAM RIVER MI
231-378 ACE TEL. CO. OF MICHIGAN, INC. 0704 COPESHTNVL MI
231-386 MICHIGAN BELL TEL CO 9323 NORTHPORT MI
231-389 MICHIGAN BELL TEL CO 9323 HARRIETTA MI
231-395 TELNET WORLDWIDE, INC. 817J GRANT MI
231-398 MICHIGAN BELL TEL CO 9323 MANISTEE MI
231-408 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIG RAPIDS MI
231-409 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-411 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-414 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWAYGO MI
231-416 AMERICAN MESSAGING SERVICES, LLC 9748 BIG RAPIDS MI
231-420 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CHEBOYGAN MI
231-423 BANDWIDTH.COM CLEC, LLC - MI 991E EVART MI
231-425 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LUDINGTON MI
231-436 MICHIGAN BELL TEL CO 9323 MACKINAWCY MI
231-437 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CHARLEVOIX MI
231-439 MICHIGAN BELL TEL CO 9323 PETOSKEY MI
231-448 ISLAND TEL. CO. 0677 ST JAMES MI
231-452 COMCAST IP PHONE, LLC 318J NEWAYGO MI
231-457 ACD TELECOM, INC. - MI 3535 MUSKEGON MI
231-460 ONVOY, LLCV - MI 543C BIG RAPIDS MI
231-462 MICHIGAN BELL TEL CO 9323 FOUNTAIN MI
231-463 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
231-464 MICHIGAN BELL TEL CO 9323 FREESOIL MI
231-465 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
231-475 BANDWIDTH.COM CLEC, LLC - MI 991E MANTON MI
231-477 KALEVA TEL. CO. 0703 BRETHREN MI
231-486 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 TRAVERSECY MI
231-487 MICHIGAN BELL TEL CO 9323 PETOSKEY MI
231-492 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.